... Trouble getting to sleep: Magnesium plays a key role in the bodily function that regulates sleep. Insomnia is one of the symptoms of magnesium deficiency ,and in fact,a 2006 analysis in the journal Medical Hypothesis suggests that such a deficiency may even be the cause of most major depression and mental health problems.… Trouble staying asleep: Potassium supplements may be helpful to those who have trouble sleeping through the night,according to a 1991 study in the journal Sleep.... When most people think about potassium,they think bananas. Bananas do contain a fair amount of this mineral (about 10 percent of...